<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      @click-left="$router.back()"
      title="黑马头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <!-- 关注功能 很多地方 使用到 因此封装成了一个组件 -->
          <!--
            模板中的 $event 是事件参数
            当我们传递给子组件的数据既要使用还要修改。
              传递：props
                :is-followed="article.is_followed"
              修改：自定义事件
                @update-is_followed="article.is_followed = $event"
            简写方式：在组件上使用 v-model
              value="article.is_followed"
              @input="article.is_followed = $event"

            如果需要修改 v-model 的规则名称，可以通过子组件的 model 属性来配置修改

            一个组件上只能使用一次 v-model，
            如果有多个数据需要实现类似于 v-model 的效果，咋办？
            可以使用属性的 .sync 修饰符。
           -->
          <follow-user
            :isFollowed="article.is_followed"
            :userid="article.aut_id"
            class="follow-btn"
            @update-isFollowed="article.is_followed = $event"
          ></follow-user>
          <!-- <van-button
            v-if="article.is_followed"
            class="follow-btn"
            type="default"
            round
            size="small"
            :loading="followLoading"
            @click="onFollow"
            >已关注</van-button
          >
          <van-button
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            :loading="followLoading"
            size="small"
            icon="plus"
            @click="onFollow"
            >关注</van-button
          > -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          v-html="article.content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论列表 -->
        <comment-list
          :source="article.art_id"
          :list="commentList"
          @onload-success="totalCommentCount = $event.total_count"
        ></comment-list>
        <!-- 文章内容加载出来 才渲染底部区域 所以底部区域放到这里 -->
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isPostShow = true"
            >写评论</van-button
          >
          <van-icon name="comment-o" :badge="totalCommentCount" color="#777" />
          <!-- 文章收藏 -->
          <collect-article
            v-model="article.is_collected"
            class="btn-item"
            :articleId="article.art_id"
          ></collect-article>
          <!-- 文章点赞 -->
          <like-article
            v-model="article.attitude"
            class="btn-item"
            :articleId="article.art_id"
          ></like-article>
          <!-- 文章分享 -->
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->

        <!-- 发布评论的弹出层 -->
        <van-popup
          v-model="isPostShow"
          position="bottom"
          :style="{ height: '30%' }"
        >
          <comment-post
            :target="article.art_id"
            @post-success="onPostSuccess"
          ></comment-post>
        </van-popup>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errstatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticle">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
  </div>
</template>

<script>
import { getArticlesById } from '@/api/article.js'
import { ImagePreview } from 'vant' //加载ImagePreviewt图片预览组件
import FollowUser from '@/components/followUser/index.vue'
import CollectArticle from '@/components/collect-article/index.vue'
import LikeArticle from '@/components/like-article/index.vue'
import CommentList from '@/views/article/component/comment-list.vue'
import CommentPost from '@/views/article/component/comment-post.vue'

export default {
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    CommentList,
    CommentPost,
  },
  name: 'ArticleIndex',
  props: {
    //路由传递路由参数 通过props来给映射到路由组件当中
    articleId: {
      type: [Number, String],
      required: true,
    },
  },
  data() {
    return {
      article: {}, //文章详情
      loading: true, //加载中的loading状态
      errstatus: 0, //失败状态码
      totalCommentCount: 0,
      isPostShow: false, //控制评论框的显示与隐藏
      commentList: [], //评论列表
    }
  },
  created() {
    this.loadArticle()
  },
  mounted() {},

  methods: {
    // 加载文章详情
    async loadArticle() {
      //重新加载 要展示loading加载中
      this.loading = true
      try {
        const { data } = await getArticlesById(this.articleId)
        //模拟网络原因等失败请求
        //  if (Math.random() > 0.5) {
        //           JSON.parse('dsankljdnskaljndlkjsa')
        //         }

        // console.log(data)
        this.article = data.data
        //请求成功 关闭loading
        // this.loading=false
      } catch (err) {
        //请求失败 关闭loading
        // this.loading=false
        if (err.response && err.response.status === 404) {
          this.errstatus = 404
        }

        this.$toast('获取数据失败')
      }
      //无论成功失败 都得关闭loading
      this.loading = false
    },
    //提交评论后的处理函数
    onPostSuccess(data) {
      // 关闭弹出层
      this.isPostShow = false
      // 将发布内容显示到顶部
      this.commentList.unshift(data.new_obj)
    },
  },
}
</script>

<style scoped lang="less">
@import './github-markdown.css';

.article-container {
  :deep(.van-icon-arrow-left) {
    color: #fff;
  }
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background-color: #fff;
  }
  .article-detail {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      :deep (p) {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    :deep (.van-icon) {
      font-size: 40px;
    }
    .comment-icon {
      top: 2px;
      color: #777;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
    .btn-item {
      border: none;
      padding: 0;
      height: 40px;
      line-height: 40px;
      color: #777777;
    }
    .collect-btn--collected {
      color: #ffa500;
    }
    .like-btn--liked {
      color: #e5645f;
    }
  }
}
</style>
